/* * Copyright (c) 2007-2012 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/init.h>#include <linux/module.h>#include <linux/if_arp.h>#include <linux/if_vlan.h>#include <linux/in.h>#include <linux/ip.h>#include <linux/jhash.h>#include <linux/delay.h>#include <linux/time.h>#include <linux/etherdevice.h>#include <linux/genetlink.h>#include <linux/kernel.h>#include <linux/kthread.h>#include <linux/mutex.h>#include <linux/percpu.h>#include <linux/rcupdate.h>#include <linux/tcp.h>#include <linux/udp.h>#include <linux/ethtool.h>#include <linux/wait.h>#include <asm/div64.h>#include <linux/highmem.h>#include <linux/netfilter_bridge.h>#include <linux/netfilter_ipv4.h>#include <linux/inetdevice.h>#include <linux/list.h>#include <linux/openvswitch.h>#include <linux/rculist.h>#include <linux/dmi.h>#include <linux/workqueue.h>#include <net/genetlink.h> #include "datapath.h"#include "flow.h"#include "vport-internal_dev.h" /** * DOC: Locking: * * Writes to device state (add/remove datapath, port, set operations on vports, * etc.) are protected by RTNL. * * Writes to other state (flow table modifications, set miscellaneous datapath * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside * genl_mutex. * * Reads are protected by RCU. * * There are a few special cases (mostly stats) that have their own * synchronization but they nest under all of above and don't interact with * each other. */ /* Global list of datapaths to enable dumping them all out. * Protected by genl_mutex. */static LIST_HEAD(dps); #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)static void rehash_flow_table(struct work_struct *work);static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table); static struct vport *new_vport(const struct vport_parms *);static int queue_gso_packets(int dp_ifindex, struct sk_buff *, const struct dp_upcall_info *);static int queue_userspace_packet(int dp_ifindex, struct sk_buff *, const struct dp_upcall_info *); /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */static struct datapath *get_dp(int dp_ifindex){ struct datapath *dp = NULL; struct net_device *dev; rcu_read_lock(); dev = dev_get_by_index_rcu(&init_net, dp_ifindex); if (dev) { struct vport *vport = ovs_internal_dev_get_vport(dev); if (vport) dp = vport->dp; } rcu_read_unlock(); return dp;} /* Must be called with rcu_read_lock or RTNL lock. */const char *ovs_dp_name(const struct datapath *dp){ struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]); return vport->ops->get_name(vport);} static int get_dpifindex(struct datapath *dp){ struct vport *local; int ifindex; rcu_read_lock(); local = rcu_dereference(dp->ports[OVSP_LOCAL]); if (local) ifindex = local->ops->get_ifindex(local); else ifindex = 0; rcu_read_unlock(); return ifindex;} static void destroy_dp_rcu(struct rcu_head *rcu){ struct datapath *dp = container_of(rcu, struct datapath, rcu); ovs_flow_tbl_destroy((__force struct flow_table *)dp->table); free_percpu(dp->stats_percpu); kfree(dp);} /* Called with RTNL lock and genl_lock. */static struct vport *new_vport(const struct vport_parms *parms){ struct vport *vport; vport = ovs_vport_add(parms); if (!IS_ERR(vport)) { struct datapath *dp = parms->dp; rcu_assign_pointer(dp->ports[parms->port_no], vport); list_add(&vport->node, &dp->port_list); } return vport;} /* Called with RTNL lock. */void ovs_dp_detach_port(struct vport *p){ ASSERT_RTNL(); /* First drop references to device. */ list_del(&p->node); rcu_assign_pointer(p->dp->ports[p->port_no], NULL); /* Then destroy it. */ ovs_vport_del(p);} /* Must be called with rcu_read_lock. */void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb){ struct datapath *dp = p->dp; struct sw_flow *flow; struct dp_stats_percpu *stats; struct sw_flow_key key; u64 *stats_counter; int error; int key_len; stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); /* Extract flow from 'skb' into 'key'. */ error = ovs_flow_extract(skb, p->port_no, &key, &key_len); if (unlikely(error)) { kfree_skb(skb); return; } /* Look up flow. */ flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); if (unlikely(!flow)) { struct dp_upcall_info upcall; upcall.cmd = OVS_PACKET_CMD_MISS; upcall.key = &key; upcall.userdata = NULL; upcall.pid = p->upcall_pid; ovs_dp_upcall(dp, skb, &upcall); consume_skb(skb); stats_counter = &stats->n_missed; goto out; } OVS_CB(skb)->flow = flow; stats_counter = &stats->n_hit; ovs_flow_used(OVS_CB(skb)->flow, skb); ovs_execute_actions(dp, skb); out: /* Update datapath statistics. */ u64_stats_update_begin(&stats->sync); (*stats_counter)++; u64_stats_update_end(&stats->sync);} static struct genl_family dp_packet_genl_family = { .id = GENL_ID_GENERATE, .hdrsize = sizeof(struct ovs_header), .name = OVS_PACKET_FAMILY, .version = OVS_PACKET_VERSION, .maxattr = OVS_PACKET_ATTR_MAX}; int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, const struct dp_upcall_info *upcall_info){ struct dp_stats_percpu *stats; int dp_ifindex; int err; if (upcall_info->pid == 0) { err = -ENOTCONN; goto err; } dp_ifindex = get_dpifindex(dp); if (!dp_ifindex) { err = -ENODEV; goto err; } if (!skb_is_gso(skb)) err = queue_userspace_packet(dp_ifindex, skb, upcall_info); else err = queue_gso_packets(dp_ifindex, skb, upcall_info); if (err) goto err; return 0; err: stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); u64_stats_update_begin(&stats->sync); stats->n_lost++; u64_stats_update_end(&stats->sync); return err;} static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb, const struct dp_upcall_info *upcall_info){ unsigned short gso_type = skb_shinfo(skb)->gso_type; struct dp_upcall_info later_info; struct sw_flow_key later_key; struct sk_buff *segs, *nskb; int err; segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM); if (IS_ERR(segs)) return PTR_ERR(segs); /* Queue all of the segments. */ skb = segs; do { err = queue_userspace_packet(dp_ifindex, skb, upcall_info); if (err) break; if (skb == segs && gso_type & SKB_GSO_UDP) { /* The initial flow key extracted by ovs_flow_extract() * in this case is for a first fragment, so we need to * properly mark later fragments. */ later_key = *upcall_info->key; later_key.ip.frag = OVS_FRAG_TYPE_LATER; later_info = *upcall_info; later_info.key = &later_key; upcall_info = &later_info; } } while ((skb = skb->next)); /* Free all of the segments. */ skb = segs; do { nskb = skb->next; if (err) kfree_skb(skb); else consume_skb(skb); } while ((skb = nskb)); return err;} static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb, const struct dp_upcall_info *upcall_info){ struct ovs_header *upcall; struct sk_buff *nskb = NULL; struct sk_buff *user_skb; /* to be queued to userspace */ struct nlattr *nla; unsigned int len; int err; if (vlan_tx_tag_present(skb)) { nskb = skb_clone(skb, GFP_ATOMIC); if (!nskb) return -ENOMEM; nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); if (!nskb) return -ENOMEM; nskb->vlan_tci = 0; skb = nskb; } if (nla_attr_size(skb->len) > USHRT_MAX) { err = -EFBIG; goto out; } len = sizeof(struct ovs_header); len += nla_total_size(skb->len); len += nla_total_size(FLOW_BUFSIZE); if (upcall_info->cmd == OVS_PACKET_CMD_ACTION) len += nla_total_size(8); user_skb = genlmsg_new(len, GFP_ATOMIC); if (!user_skb) { err = -ENOMEM; goto out; } upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 0, upcall_info->cmd); upcall->dp_ifindex = dp_ifindex; nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); ovs_flow_to_nlattrs(upcall_info->key, user_skb); nla_nest_end(user_skb, nla); if (upcall_info->userdata) nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA, nla_get_u64(upcall_info->userdata)); nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); skb_copy_and_csum_dev(skb, nla_data(nla)); err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid); out: kfree_skb(nskb); return err;} /* Called with genl_mutex. */static int flush_flows(int dp_ifindex){ struct flow_table *old_table; struct flow_table *new_table; struct datapath *dp; dp = get_dp(dp_ifindex); if (!dp) return -ENODEV; old_table = genl_dereference(dp->table); new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); if (!new_table) return -ENOMEM; rcu_assign_pointer(dp->table, new_table); ovs_flow_tbl_deferred_destroy(old_table); return 0;} static int validate_actions(const struct nlattr *attr, const struct sw_flow_key *key, int depth); static int validate_sample(const struct nlattr *attr, const struct sw_flow_key *key, int depth){ const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; const struct nlattr *probability, *actions; const struct nlattr *a; int rem; memset(attrs, 0, sizeof(attrs)); nla_for_each_nested(a, attr, rem) { int type = nla_type(a); if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) return -EINVAL; attrs[type] = a; } if (rem) return -EINVAL; probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; if (!probability || nla_len(probability) != sizeof(u32)) return -EINVAL; actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) return -EINVAL; return validate_actions(actions, key, depth + 1);} static int validate_tp_port(const struct sw_flow_key *flow_key){ if (flow_key->eth.type == htons(ETH_P_IP)) { if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst) return 0; } else if (flow_key->eth.type == htons(ETH_P_IPV6)) { if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst) return 0; } return -EINVAL;} static int validate_set(const struct nlattr *a, const struct sw_flow_key *flow_key){ const struct nlattr *ovs_key = nla_data(a); int key_type = nla_type(ovs_key); /* There can be only one key in a action */ if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) return -EINVAL; if (key_type > OVS_KEY_ATTR_MAX || nla_len(ovs_key) != ovs_key_lens[key_type]) return -EINVAL; switch (key_type) { const struct ovs_key_ipv4 *ipv4_key; case OVS_KEY_ATTR_PRIORITY: case OVS_KEY_ATTR_ETHERNET: break; case OVS_KEY_ATTR_IPV4: if (flow_key->eth.type != htons(ETH_P_IP)) return -EINVAL; if (!flow_key->ip.proto) return -EINVAL; ipv4_key = nla_data(ovs_key); if (ipv4_key->ipv4_proto != flow_key->ip.proto) return -EINVAL; if (ipv4_key->ipv4_frag != flow_key->ip.frag) return -EINVAL; break; case OVS_KEY_ATTR_TCP: if (flow_key->ip.proto != IPPROTO_TCP) return -EINVAL; return validate_tp_port(flow_key); case OVS_KEY_ATTR_UDP: if (flow_key->ip.proto != IPPROTO_UDP) return -EINVAL; return validate_tp_port(flow_key); default: return -EINVAL; } return 0;} static int validate_userspace(const struct nlattr *attr){ static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 }, }; struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];Lines 1–500 of 1928. 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/* * Copyright (c) 2007-2012 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/init.h> #include <linux/module.h> #include <linux/if_arp.h> #include <linux/if_vlan.h> #include <linux/in.h> #include <linux/ip.h> #include <linux/jhash.h> #include <linux/delay.h> #include <linux/time.h> #include <linux/etherdevice.h> #include <linux/genetlink.h> #include <linux/kernel.h> #include <linux/kthread.h> #include <linux/mutex.h> #include <linux/percpu.h> #include <linux/rcupdate.h> #include <linux/tcp.h> #include <linux/udp.h> #include <linux/ethtool.h> #include <linux/wait.h> #include <asm/div64.h> #include <linux/highmem.h> #include <linux/netfilter_bridge.h> #include <linux/netfilter_ipv4.h> #include <linux/inetdevice.h> #include <linux/list.h> #include <linux/openvswitch.h> #include <linux/rculist.h> #include <linux/dmi.h> #include <linux/workqueue.h> #include <net/genetlink.h> #include "datapath.h" #include "flow.h" #include "vport-internal_dev.h" /** * DOC: Locking: * * Writes to device state (add/remove datapath, port, set operations on vports, * etc.) are protected by RTNL. * * Writes to other state (flow table modifications, set miscellaneous datapath * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside * genl_mutex. * * Reads are protected by RCU. * * There are a few special cases (mostly stats) that have their own * synchronization but they nest under all of above and don't interact with * each other. */ /* Global list of datapaths to enable dumping them all out. * Protected by genl_mutex. */ static LIST_HEAD(dps); #define REHASH_FLOW_INTERVAL (10 * 60 * HZ) static void rehash_flow_table(struct work_struct *work); static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table); static struct vport *new_vport(const struct vport_parms *); static int queue_gso_packets(int dp_ifindex, struct sk_buff *, const struct dp_upcall_info *); static int queue_userspace_packet(int dp_ifindex, struct sk_buff *, const struct dp_upcall_info *); /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */ static struct datapath *get_dp(int dp_ifindex) { struct datapath *dp = NULL; struct net_device *dev; rcu_read_lock(); dev = dev_get_by_index_rcu(&init_net, dp_ifindex); if (dev) { struct vport *vport = ovs_internal_dev_get_vport(dev); if (vport) dp = vport->dp; } rcu_read_unlock(); return dp; } /* Must be called with rcu_read_lock or RTNL lock. */ const char *ovs_dp_name(const struct datapath *dp) { struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]); return vport->ops->get_name(vport); } static int get_dpifindex(struct datapath *dp) { struct vport *local; int ifindex; rcu_read_lock(); local = rcu_dereference(dp->ports[OVSP_LOCAL]); if (local) ifindex = local->ops->get_ifindex(local); else ifindex = 0; rcu_read_unlock(); return ifindex; } static void destroy_dp_rcu(struct rcu_head *rcu) { struct datapath *dp = container_of(rcu, struct datapath, rcu); ovs_flow_tbl_destroy((__force struct flow_table *)dp->table); free_percpu(dp->stats_percpu); kfree(dp); } /* Called with RTNL lock and genl_lock. */ static struct vport *new_vport(const struct vport_parms *parms) { struct vport *vport; vport = ovs_vport_add(parms); if (!IS_ERR(vport)) { struct datapath *dp = parms->dp; rcu_assign_pointer(dp->ports[parms->port_no], vport); list_add(&vport->node, &dp->port_list); } return vport; } /* Called with RTNL lock. */ void ovs_dp_detach_port(struct vport *p) { ASSERT_RTNL(); /* First drop references to device. */ list_del(&p->node); rcu_assign_pointer(p->dp->ports[p->port_no], NULL); /* Then destroy it. */ ovs_vport_del(p); } /* Must be called with rcu_read_lock. */ void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) { struct datapath *dp = p->dp; struct sw_flow *flow; struct dp_stats_percpu *stats; struct sw_flow_key key; u64 *stats_counter; int error; int key_len; stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); /* Extract flow from 'skb' into 'key'. */ error = ovs_flow_extract(skb, p->port_no, &key, &key_len); if (unlikely(error)) { kfree_skb(skb); return; } /* Look up flow. */ flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); if (unlikely(!flow)) { struct dp_upcall_info upcall; upcall.cmd = OVS_PACKET_CMD_MISS; upcall.key = &key; upcall.userdata = NULL; upcall.pid = p->upcall_pid; ovs_dp_upcall(dp, skb, &upcall); consume_skb(skb); stats_counter = &stats->n_missed; goto out; } OVS_CB(skb)->flow = flow; stats_counter = &stats->n_hit; ovs_flow_used(OVS_CB(skb)->flow, skb); ovs_execute_actions(dp, skb); out: /* Update datapath statistics. */ u64_stats_update_begin(&stats->sync); (*stats_counter)++; u64_stats_update_end(&stats->sync); } static struct genl_family dp_packet_genl_family = { .id = GENL_ID_GENERATE, .hdrsize = sizeof(struct ovs_header), .name = OVS_PACKET_FAMILY, .version = OVS_PACKET_VERSION, .maxattr = OVS_PACKET_ATTR_MAX }; int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, const struct dp_upcall_info *upcall_info) { struct dp_stats_percpu *stats; int dp_ifindex; int err; if (upcall_info->pid == 0) { err = -ENOTCONN; goto err; } dp_ifindex = get_dpifindex(dp); if (!dp_ifindex) { err = -ENODEV; goto err; } if (!skb_is_gso(skb)) err = queue_userspace_packet(dp_ifindex, skb, upcall_info); else err = queue_gso_packets(dp_ifindex, skb, upcall_info); if (err) goto err; return 0; err: stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); u64_stats_update_begin(&stats->sync); stats->n_lost++; u64_stats_update_end(&stats->sync); return err; } static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb, const struct dp_upcall_info *upcall_info) { unsigned short gso_type = skb_shinfo(skb)->gso_type; struct dp_upcall_info later_info; struct sw_flow_key later_key; struct sk_buff *segs, *nskb; int err; segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM); if (IS_ERR(segs)) return PTR_ERR(segs); /* Queue all of the segments. */ skb = segs; do { err = queue_userspace_packet(dp_ifindex, skb, upcall_info); if (err) break; if (skb == segs && gso_type & SKB_GSO_UDP) { /* The initial flow key extracted by ovs_flow_extract() * in this case is for a first fragment, so we need to * properly mark later fragments. */ later_key = *upcall_info->key; later_key.ip.frag = OVS_FRAG_TYPE_LATER; later_info = *upcall_info; later_info.key = &later_key; upcall_info = &later_info; } } while ((skb = skb->next)); /* Free all of the segments. */ skb = segs; do { nskb = skb->next; if (err) kfree_skb(skb); else consume_skb(skb); } while ((skb = nskb)); return err; } static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb, const struct dp_upcall_info *upcall_info) { struct ovs_header *upcall; struct sk_buff *nskb = NULL; struct sk_buff *user_skb; /* to be queued to userspace */ struct nlattr *nla; unsigned int len; int err; if (vlan_tx_tag_present(skb)) { nskb = skb_clone(skb, GFP_ATOMIC); if (!nskb) return -ENOMEM; nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); if (!nskb) return -ENOMEM; nskb->vlan_tci = 0; skb = nskb; } if (nla_attr_size(skb->len) > USHRT_MAX) { err = -EFBIG; goto out; } len = sizeof(struct ovs_header); len += nla_total_size(skb->len); len += nla_total_size(FLOW_BUFSIZE); if (upcall_info->cmd == OVS_PACKET_CMD_ACTION) len += nla_total_size(8); user_skb = genlmsg_new(len, GFP_ATOMIC); if (!user_skb) { err = -ENOMEM; goto out; } upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 0, upcall_info->cmd); upcall->dp_ifindex = dp_ifindex; nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); ovs_flow_to_nlattrs(upcall_info->key, user_skb); nla_nest_end(user_skb, nla); if (upcall_info->userdata) nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA, nla_get_u64(upcall_info->userdata)); nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); skb_copy_and_csum_dev(skb, nla_data(nla)); err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid); out: kfree_skb(nskb); return err; } /* Called with genl_mutex. */ static int flush_flows(int dp_ifindex) { struct flow_table *old_table; struct flow_table *new_table; struct datapath *dp; dp = get_dp(dp_ifindex); if (!dp) return -ENODEV; old_table = genl_dereference(dp->table); new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); if (!new_table) return -ENOMEM; rcu_assign_pointer(dp->table, new_table); ovs_flow_tbl_deferred_destroy(old_table); return 0; } static int validate_actions(const struct nlattr *attr, const struct sw_flow_key *key, int depth); static int validate_sample(const struct nlattr *attr, const struct sw_flow_key *key, int depth) { const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; const struct nlattr *probability, *actions; const struct nlattr *a; int rem; memset(attrs, 0, sizeof(attrs)); nla_for_each_nested(a, attr, rem) { int type = nla_type(a); if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) return -EINVAL; attrs[type] = a; } if (rem) return -EINVAL; probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; if (!probability || nla_len(probability) != sizeof(u32)) return -EINVAL; actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) return -EINVAL; return validate_actions(actions, key, depth + 1); } static int validate_tp_port(const struct sw_flow_key *flow_key) { if (flow_key->eth.type == htons(ETH_P_IP)) { if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst) return 0; } else if (flow_key->eth.type == htons(ETH_P_IPV6)) { if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst) return 0; } return -EINVAL; } static int validate_set(const struct nlattr *a, const struct sw_flow_key *flow_key) { const struct nlattr *ovs_key = nla_data(a); int key_type = nla_type(ovs_key); /* There can be only one key in a action */ if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) return -EINVAL; if (key_type > OVS_KEY_ATTR_MAX || nla_len(ovs_key) != ovs_key_lens[key_type]) return -EINVAL; switch (key_type) { const struct ovs_key_ipv4 *ipv4_key; case OVS_KEY_ATTR_PRIORITY: case OVS_KEY_ATTR_ETHERNET: break; case OVS_KEY_ATTR_IPV4: if (flow_key->eth.type != htons(ETH_P_IP)) return -EINVAL; if (!flow_key->ip.proto) return -EINVAL; ipv4_key = nla_data(ovs_key); if (ipv4_key->ipv4_proto != flow_key->ip.proto) return -EINVAL; if (ipv4_key->ipv4_frag != flow_key->ip.frag) return -EINVAL; break; case OVS_KEY_ATTR_TCP: if (flow_key->ip.proto != IPPROTO_TCP) return -EINVAL; return validate_tp_port(flow_key); case OVS_KEY_ATTR_UDP: if (flow_key->ip.proto != IPPROTO_UDP) return -EINVAL; return validate_tp_port(flow_key); default: return -EINVAL; } return 0; } static int validate_userspace(const struct nlattr *attr) { static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 }, }; struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];